A weekly version of Jenkins was installed (2.42). Uninstalled that version and installed a LTS version (2.32.2). Jenkins shows the following notification: "New version of Jenkins (2.43) is available for download".
It should detect this is a LTS installation and only prompt to update to LTS versions.
Additionally, incompatible versions of plugins could be offered, when a more appropriate update site would offer compatible releases.
On upgrade, Jenkins might miss new plugins not available to the previous baseline, such as detached plugins.